Process of producing beta-methyladipic acid.



UNITED STATES PATENT OFFICE.

CORPORATION OF GERMANY.

, FRITZ HOFMANN AND CARL COUTELLE, O'F ELBERFELD, GERMANY, ASSIG-NORS TO FARBENFABRIKEN VORM. FRIEDR. BAYER & 00., OF ELBERF PROCESS OF- PRODUCING BETA-METHYL ADIPIC ACID.

No Drawing.

Specification or Letters Patent.

Application filed November 23, 1909. Serial No. 529,544. I

Patented May 9, 1911.

To all whom it may concern:

Be it known that We, FRITZ HOFMANN and CARL CoU'rELLn, doctors of philosophy, chemists, citizens of the German Empire,' residing at Elberfeld, Germany, have in- -vented new and useful Improvements in Processes of Producing Beta-Methlyladipic Acid, of which the following is a specification. M

Our invention relates to a new and valu-' able process for producing beta-methyladipic acid which is a Valuable intermediate compound for producing other products of technical importance.

The new process consists in treating paramethyl-cyclohexa'nol CH CHa CH: C 2

C H O H with oxidizing agents, such as HNO In order to illustrate the new process more fully we can proceed as follows, the parts being by weight: A solution of 22.5 parts of KMnO, in 420 parts of water is slowly added to a suspension of 5 parts of para-methyl,- cyclohexanol in a solution of parts of crystallized sodium carbonate in 83 parts of water. The mixture is filtered, the filtrate is. evaporated to parts 'and 10 parts of concentrated HCl' are added. The betamethyladipic' acid separates. It can be purificd by a recrystallization from benzene.

The formation of the product takes probably place according to the following formu a:

(i113 (.fHg (1H CH CH CH2 CH2 CH2 a a CH2 H2 CODE Methyladipic acid is mainly used in synthetic chemistry for the production of pharmaceutical products, colors, terpenes and other technical substances. Other oxidizing agents can be used.

.We claim I l. The process for producing beta-methyladipic acid, which process consists in treating para-methylcyclohexanol with oxidizing I E LD, GERMANY, A 

